Insulator



odel.)

J. S. CLEVELAND 81; G. P. K

Nov. 11, 1884.

Patente NE SSES, INVENTOR) @fimfl cv 1 UNITED STATES PATENT @EEICE.

JOHN S. CLEVELAND AND GEORGE F. KENT, OF NORRIDGE\VOCK, MAINE.

t N S U LATO P.

SPECIFICATION forming part of Letters Patent No. 30?,916, dated November 11, 1884.

Application filed February 23, 1554. (No model.)

To all whom, it may concern: end, as shown. This mortise is fitted to re- Be it known that we, JOHN S. CLEVELAND ceive the insulating-blocks, and is provided and GEORGE F. KENT, citizens of the United with a groove or keyway, The insulating- 5 States, residing at Norridgewock. in the counblocks are made with a key, A-, which slides 5 ty of Somerset and State of Maine, have inin said keyway and prevents the rotation of vented certain new and useful Improvements the blocks when the latter are made cylindriin Insulators; and we do declare the "following cal. \Vhen the said blocks are made angular to be afull, clear, and exact description of the in cross-section, such keyway and rib or key 60 invention, such as will enable others skilled will not be required. A transverse slot, 1),

in the art to which it appertains to make and intersects the mortise G from the upper side use the same, reference being had to the acof the casing about midway the ends of same. companying drawings, and to the letters and This slot is so formed as to permit the wire to figures of reference marked thereon, which be inserted between blocks A from above, and 6 form a part of this specification. also to form space on opposite sides of the Our invention relates to insulators; and it wire as the latter extends outward from the consists in the construction, combination, and blocks, so as to prevent the current passing arrangement of the several parts, as will be ot't' through the support or casing. A crosshereinafter described and claimed. bar, E, is removably secured at the end of the 70 In the drawings, Figure 1 is a perspective casing at which mortise 0 opens, and extends view. Fig. 2 is a transverse section. Fig. 8 across said slot or mortise, as shown. IVe is an end view. Fig. at is atop plan view. Fig. prefer to secure this key by passingit through 5 is a side elevation of our improved insulathe slots E in the casing, as shown. A set tor, all of which will be described. screw, F, turns through the bar E and bears 75 The insulator-blocks A A are made of glass against the outer one of blocks A, fOrGillg it or other suitablematerial. In operation they against the inner blocks, clan'iping the wire are held with their ends close together. These securely thereto, as will be understood. meeting ends are provided with coincident For convenience in securing the support to grooves A, preferablycurved to fit the wire the pole or in other desired position, we pro 3 B, and one or both are made of a depth less vide it with perforated lugs or cars, G G,

than the semi-diameter of said wire, as shown, through which retainingscrews may be passed. so that when pressed together they will firm] y It is manifest that instead of the crossbar or clamp and hold the said wire. This bviat key and set-screw, as shown and described, vathe winding of the wire on the insulators, and riousmeditied constructionsmay be employed 5 th b n mi S th l th r wi th without departing from the broad principles wear of same incident toits bending, and does of o r invention. An opening, ll, is formed away with the necessity of wire for binding through the casing at the base or inner end of the electric wire to the insulator, as is sornemortise C, so the hand or a suitable impletimes practiced,instead of winding the electric ment can be pressed against the inner block 0 wire on the insulator, as will be understood. and force the blocks out of the casing when so It will be observed that our invention, desired.

broadly speaking, comprises two insulator- Having thus described our invention, what blocks adapted at their meeting ends to clamp we claim, and desire to secure by Letters Iatthe wire, combined with the means for clampcut, is- 95 ing the said blocks together. 1. The insulator herein described, consist- The supporting and block-clamping devices ing of the casing mortised from. one end to re may, it is manifest, be constructed in various ceive the blocks, and proyided with a trans-- ways without departing from the principles of verse slot intersecting said mortise at a point our invention; but in practice we prefer to approximately midway the same, and the in- 100 construct said devices as shown and will be sulatingblocks held in said mortise with their now described. meeting faces opposite'the intersecting slot,

The support or casing G is provided with a substantially as set forth. longitudinal mortise, 0, extended from one 2. In an insulator, the combination, with iii the casing having a longitudinal mortise. and provided with slots near the outer end there of, and the blOOliS placed in said mortise and adapted at their meeting ends to clamp the wire, of the crossbar removably held in the slots of the easing, and the set-screw turned through said bar in position to bear against the outer block, substantialh as set forth.

3. The combination of the casing mortised from one end, the insulating-blocks inserted in said mortise, a removable bearing-bar, and a clamping-screw turned through said bar and against the adjacent insulator, binding said parts jlh'mly together, substantially as set forth.

t. The combination of the casing having a longitudinal mortise, t", formed with a wing or keyway, C and the insulatingbloeks inserted in said mortise, and formed with a rib fitted to the keyway thereoi', substantially as set forth.

5. An insulator comprising a supportingframe, insulating-blocks having at their inner l'aees grooves adapted to fit on the wire and made of a depth less than the semi-diameter of the said. wire and in continuous unbroken c0- ineident lines, and the elai'npingserew turned against one of these blocks and pressing the same toward the other and on the wire,whereby the latter is firmly held, the said elainping action or strain being exerted in a line approximately radial to the wire, whereby the torsional strain of the said wire will not affect the clamping thereof,substantially as set forth.

In testimony whereof we al'lix our signatures in presence of two witnesses.

JOHN S. CLEVELAND. H110. F. KENT.

Witnesses:

Gno. N. PAGE, Eu. 1. PAGE. 

